WATCHES: Severe Thunderstorm Watch Number 344

WWUS20 KWNS 031827
SEL4
SPC WW 031827
ALZ000-MSZ000-040200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 344
NWS STORM PREDICTION CENTER NORMAN OK
130 PM CDT SUN JUN 3 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

NORTHERN ALABAMA
EXTREME NORTHEAST MISSISSIPPI

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST
OF MUSCLE SHOALS ALABAMA TO 20 MILES EAST OF ANNISTON ALABAMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...SCATTERED STRONG TO SEVERE STORMS ARE EXPECTED TO
INCREASE IN BOTH COVERAGE AND INTENSITY ALONG A WEAK WARM FRONTAL
ZONE DRAPED OVER NRN MS/AL. LIFT ALONG/ACROSS THIS BOUNDARY IS AIDED
BY A 20-30KT WLY LOW LEVEL JET AND MODEST 30KT NWLY FLOW AT MID
LEVELS WILL CONTRIBUTE TO SUFFICIENT SHEAR TO MAINTAIN UPDRAFT
ORGANIZATION AND PERSISTENCE. AIRMASS ALONG AND SOUTH OF THE
BOUNDARY IS VERY UNSTABLE ACROSS MS BUT LESS SO TO THE NORTH OF THE
BOUNDARY...OVER NRN AL. HOWEVER...LATEST SATL IMAGERY INDICATES THAT
STRONG HEATING SHOULD CONTINUE ACROSS NRN AL IN ADVANCE OF THE
ONGOING CONVECTION AND ADDITIONAL CELLS MAY DEVELOP ALONG THE FRONT
AND MOVE INTO AL THROUGH THE AFTERNOON. SOMEWHAT DRIER BOUNDARY
LAYER IN THIS REGION MAY SUPPORT DOWNBURST WIND POTENTIAL. IN
ADDITION TO LOCALLY STRONG DOWNBURST WINDS...LARGE HAIL IS POSSIBLE
WITH ANY OF THE PERSISTENT ROTATING STORMS GIVEN MAGNITUDE OF
AVAILABLE INSTABILITY TO THIS DEVELOPING CONVECTION.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29035.


...CARBIN

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